CVE-2026-46021 thermal: core: Fix thermal zone governor cleanup issues
Description
In the Linux kernel, the following vulnerability has been resolved: thermal: core: Fix thermal zone governor cleanup issues If thermal_zone_device_register_with_trips() fails after adding a thermal governor to the thermal zone being registered, the governor is not removed from it as appropriate which may lead to a memory leak. In turn, thermal_zone_device_unregister() calls thermal_set_governor() without acquiring the thermal zone lock beforehand which may race with a governor update via sysfs and may lead to a use-after-free in that case. Address these issues by adding two thermal_set_governor() calls, one to thermal_release() to remove the governor from the given thermal zone, and one to the thermal zone registration error path to cover failures preceding the thermal zone device registration.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux 7.1 | earliest → < 7.1 | 7.1 |
| Linux 7.0 | earliest → < 7.0.4 | 7.0.4 |
| Linux 6.18 | earliest → < 6.18.27 | 6.18.27 |
| Linux 6.12 | earliest → < 6.12.86 | 6.12.86 |
| Linux 6.6 | earliest → < 6.6.140 | 6.6.140 |
| Linux 6.1 | earliest → < 6.1.176 | 6.1.176 |
| Linux 5.15 | earliest → < 5.15.210 | 5.15.210 |
| Linux 5.10 | earliest → < 5.10.259 | 5.10.259 |
| Linux | 4.2 | No fix stated |
Show the 4 other branches Hide the 4 other branches
| Product | Affected versions | Fixed in |
|---|---|---|
| SIMATIC S7-1500 CPU 1518-4 PN/DP MFP 3.1 | 3.1.7 → latest | No fix stated |
| SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP 3.1 | 3.1.7 → latest | No fix stated |
| SIPLUS S7-1500 CPU 1518-4 PN/DP MFP 3.1 | 3.1.7 → latest | No fix stated |
| SIMATIC S7-1500 TM MFP - GNU/Linux subsystem | Versions not published |